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Molecular dynamics simulations of the solubility and conformation change of chitosan grafted polyacrylamide: Impact of grafting rate
Date
2024-01-01
Author
Zhao, Wei
Zou, Wenjie
Liu, Fengyang
Zhou, Fang
Altun, Naci Emre
Metadata
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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Graft modification is an effective approach to improve the water solubility and molecular weight of chitosan. This work investigated the effect of grafting rate on water solubility of chitosan-grafted polyacrylamide (Chi-g-PAM) using molecular dynamics simulations. The intramolecular and intermolecular interaction between Chi-g-PAM with the grafting rate of 100%–250% and water together with the conformation change were analyzed by radial distribution function (RDF), radius of gyration, solvation free energy (ΔGSFE), mean square displacement, diffusion coefficient and shear viscosity. The results showed that the intramolecular hydrogen bonding of Chi-g-PAM was the dominant factor affecting its water solubility. While the grafting rate of Chi-g-PAM increased from 100% to 250%, the RDF of Chi-g-PAM decreased from 5.39 to 3.57 between O–H at 2.0 Å and 2.60 to 1.30 between N–H at 2.1 Å. The interaction between Chi-g-PAM and water increased with grafting rate as the absolute value of ΔGSFE for Chi-g-PAM increased from 432.917 kcal/mol to 858.749 kcal/mol. The solubility of Chi-g-PAM in acidic solution was much better than that of Chi-g-PAM in aqueous solution. Our work on the fundamental insights into the effect of grafted molecular structure of chitosan-based copolymer on its solubility will benefit the development of environmentally friendly chitosan-based flocculants.
Subject Keywords
Chitosan-grafted-polyacrylamide
,
Conformation
,
Molecular dynamics simulation
,
Water solubility
URI
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85176355252&origin=inward
https://hdl.handle.net/11511/107918
Journal
Journal of Molecular Graphics and Modelling
DOI
https://doi.org/10.1016/j.jmgm.2023.108660
Collections
Department of Mining Engineering, Article
Citation Formats
IEEE
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BibTeX
W. Zhao, W. Zou, F. Liu, F. Zhou, and N. E. Altun, “Molecular dynamics simulations of the solubility and conformation change of chitosan grafted polyacrylamide: Impact of grafting rate,”
Journal of Molecular Graphics and Modelling
, vol. 126, pp. 0–0, 2024, Accessed: 00, 2024. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85176355252&origin=inward.